Okay, those files are from CDN, so that’s fine. That’s not affected by this.
But if you do have any files that are loaded in the HTML as URLs like /example.css, they will be loaded from the root of your site instead of from /frontend/example.css for example.
But I’m not really clear on what’s not working. What server are you running upstream? Check if there’s any configuration for it where you need to set a “base path” or whatever.